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              我們如何區分斷路器的分斷能力?

              來源:http://www.cekidots.com/ 日期:2021-05-31 發布人:tongjid

              斷路器的分斷能力是斷路器的一項重要指標,是指斷路器安 全切斷故障電流的能力,一般分為額定限短路分斷能力ICU和額定運行短路分斷能力ICS。分斷能力有35KA、50KA、60KA、80KA等多種規格,而國內的小型斷路器其限短路能力一般在4-6KA之間,而且分斷可靠性不高。

              Breaking capacity of circuit breaker is an important index of circuit breaker, which refers to the ability of circuit breaker to safely cut off fault current. It is generally divided into rated limit short-circuit breaking capacity ICU and rated operation short-circuit breaking capacity ICs. The breaking capacity has 35ka, 50kA, 60kA, 80kA and other specifications, while the short-circuit limiting capacity of domestic miniature circuit breakers is generally between 4-6ka, and the breaking reliability is not high.
              假如ICU=50KA,那么當電路中發生50KA故障電流時,斷路器可以安 全的切斷電路,而不會發生觸頭粘接等狀況,但發生限短路分斷的斷路器不可以再使用。而假如IUS=50KA,當發生50KA故障電流時,斷路器可以安 全切斷電路,在故障排除時可以再合閘使用,當然也是更換斷路器。
              If ICU = 50kA, then when 50kA fault current occurs in the circuit, the circuit breaker can safely cut off the circuit without contact bonding and other conditions, but the circuit breaker with limited short circuit breaking can no longer be used. And if IUS = 50kA, when 50kA fault current occurs, the circuit breaker can safely cut off the circuit, and it can be reclosed for use when troubleshooting. Of course, it is also to replace the circuit breaker.
              ABB微型斷路器價格
              選擇斷路器的一項重要原則就是斷路器的限短路分斷能力要大于線路的預期短路電流。無論哪種斷路器,它的短路分斷能力都大于或等于其運行短路分斷能力。
              An important principle in selecting circuit breakers is that the short-circuit breaking capacity of circuit breakers should be greater than the expected short-circuit current of lines. No matter what kind of circuit breaker, its short-circuit breaking capacity is greater than or equal to its operating short-circuit breaking capacity.
              斷路器的分斷能力是否越大越好呢,那是肯定的。分斷能力越大,安 全性越高。例如當選擇ICU為35KA時,如果線路中短路電流為20KA時為及時安 全切斷;但如果ICU為20KA,則短路電流為35KA時就無法斷開了。雖然分斷能力越大越好,但是價位也會越高,還是要根據自身使用情況在保證足夠安 全的前提下,經濟的選擇合適的斷路器。
              It is certain that the greater the breaking capacity of the circuit breaker, the better. The greater the breaking capacity, the higher the safety. For example, when the ICU is 35ka, if the short circuit current in the line is 20KA, it is safe to cut off in time; However, if the ICU is 20KA, it cannot be disconnected when the short-circuit current is 35ka. Although the greater the breaking capacity, the better, but the price will also be higher, or according to their own use, in the premise of ensuring sufficient safety, the economic choice of the appropriate circuit breaker.


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